Elixir implementation of split line feed aware

gistfile1.ex

defp split_lf_aware(str, 0, "", line), do: { line, to_string(str) }
defp split_lf_aware(str, 0, acc, line), do: { acc, line <> to_string(str) }
defp split_lf_aware("", _, acc, line), do: { acc + line, "" }

defp split_lf_aware("\n" <> str, pos, acc, line) do
  split_lf_aware(str, pos-1, acc <> line <> "\n", "")
end

defp split_lf_aware(<<chr :: utf8>> <> str, pos, acc, line) do
  split_lf_aware(str, pos-1, acc, line <> <<chr :: utf8>>)
end

def split_lf_aware(str, pos) do
  split_lf_aware(str, pos, "", "")
end